<template>
    <el-container class="home-container">
      <!--头部区域-->
      <el-header>
       <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
       </div>
       <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!--页面主体区域-->
      <el-container>
      <!--侧边栏-->
       <el-aside :width="isCollapse ? '64px':'200px'" >
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu background-color="#545c64" text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="isCollapse" :collapse-transition="false" :router="true">
      <!--一级菜单-->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
      <!--一级菜单的模板区域-->
        <template slot="title">
        <!--图标-->
          <i :class="iconsObj[item.id]"></i>
          <!--文本-->
          <span>{{item.authName}}</span>
        </template>
        <!--二级菜单-->
          <el-menu-item :index="'/'+subItem.path " v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)" :default-active="activePath">
            <template slot="title">
            <!--图标-->
            <i class="el-icon-menu"></i>
            <!--文本-->
            <span>{{subItem.authName}}</span>
            </template>
          </el-menu-item>
      </el-submenu>
    </el-menu>
       </el-aside>
       <!--右侧内容主体-->
       <el-main>
        <!--路由占位符-->
        <router-view></router-view>
       </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      // 是否折叠
      isCollapse: true,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItems('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(this.menulist)
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      // eslint-disable-next-line no-unused-expressions
      // eslint-disable-next-line no-sequences
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height:100%
  }
  .el-header {
    background-color: #545c64;
    display:flex;
    justify-content:space-between;
    padding-left:0px;
    align-items:center;
    color:#E9EEF3;
    font-size:20px;
    > div {
      display:flex;
      align-items:center
    }
    span {
      margin-left:15px
    }

  }
  .el-aside {
    background-color:#545c64;
    .el-menu {
      border-right:none;
    }
  }
  .el-main {
    background-color: #E9EEF3;
  }
  .iconfont {
    margin-right:10px;
  }
  .toggle-button {
    font-size:10px;
    background-color: #4A5064;
    text-align:center;
    line-height:24px;
    color:#fff;
    letter-spacing: 0.2em;
    cursor: pointer;
  }

</style>
